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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ICS3002AI01L датащи(PDF) 9 Page - Integrated Circuit Systems |
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ICS3002AI01L датащи(HTML) 9 Page - Integrated Circuit Systems |
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9 / 15 page  843002AGI-01 www.icst.com/products/hiperclocks.html REV. A JANUARY 6, 2006 9 Integrated Circuit Systems, Inc. ICS843002I-01 FEMTOCLOCKS™CRYSTAL-TO- 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER TERMINATION FOR 2.5V LVPECL OUTPUT Figure 4A and Figure 4B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to ter- minating 50 Ω to V CC - 2V. For VCCO = 2.5V, the VCCO - 2V is very close to ground level. The R3 in Figure 4B can be eliminated and the termination is shown in Figure 4C. FIGURE 4C. 2.5V LVPECL TERMINATION EXAMPLE R2 50 Zo = 50 Ohm VCCO=2.5V R1 50 Zo = 50 Ohm + - 2.5V 2,5V LVPECL Driv er FIGURE 4B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE VCCO=2.5V R1 50 R2 50 Zo = 50 Ohm R3 18 2,5V LVPECL Driv er Zo = 50 Ohm + - 2.5V FIGURE 4A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE R2 62.5 2.5V 2,5V LVPECL Driv er R3 250 Zo = 50 Ohm Zo = 50 Ohm R4 62.5 2.5V + - R1 250 VCCO=2.5V |
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